300 remington ultra mag

My main target is dall sheep. I would like to get a grizzly as I see them every year. However, they are allways on another ridge 300 or 400 yards away. Thirdly I would also like to take this gun after some wolf in the winter, but I don't want to blow him in two.

What loads would you recommend for each of these? I've been using a 30.06 with factory ammo since whenever so I'm knew to the reloading and technical stuff.